Enhancement - Hooks

- Implemented pre-debug, post-debug.
- Implemented pre-header, post-header.
- Implemented pre-output, post-output.
- Implemented pre-footnote, post-footnote.
- Implemented pre-gc, post-gc.
- Implemented pre-undo, post-undo.
- Implemented pre-add-command, post-add-command.

src/command.cpp

@@ -52,6 +52,7 @@ extern Context context;
 ////////////////////////////////////////////////////////////////////////////////
 int handleAdd (std::string &outs)
 {
+  context.hooks.trigger ("pre-add-command");
   std::stringstream out;
 
   context.task.set ("uuid", uuid ());
@@ -112,6 +113,7 @@ int handleAdd (std::string &outs)
   context.tdb.unlock ();
 
   outs = out.str ();
+  context.hooks.trigger ("post-add-command");
   return 0;
 }